Sound absorbing surface



FIG. 1 is an isometric view of a sound absorbing surface showing my new design;

FIG. 2 is a front elevation view thereof; and,

FIG. 3 is a left-hand side elevation view thereof; the right-hand side view is a mirror image of the left-hand-side view.

Portions of the article not shown form no part of the claimed design. 

CLAIM The ornamental design for a sound absorbing surface, as shown and described. 